Code-form converter and communication system



April 11, 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 1 TAPE READER TAPE PUNCH l I IWL' 9 W MOTOR wk l 1 1 i. 1 it,

mun g w o DISTRIBUTOR 12 l COLLECTOR FIG. 2 18 ATTORNEY NVW mi; OBlodgeTr April 11, 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 3 INVENTOR. Edwin OBlodgeTr ATTORNEY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 4 DCSC DSSC

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INVENTOR. Edwin OBIoclgerr FIG. 7

ATTORNEY April 11,- 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 5 M 1 g MT e /Lv#h m L w. :HH M 2 n w a r? /Q(.O 77W 2 m 4 d LT] B E O H Al 0 I b, 1 b .I W HM M K 7 m n w 1 1 B c o o 0 @M O. 6 w 2 w l\\ V 9 rm/ D I 1: m & .M w@ 1 m 5 w n- 7 a T i W 1 fl. w 7 t w 7 o ww C H w I H 5 L o C m J m w 4 m a m b FIG.

ATTORNEY April 11, 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 6 FIG. 12

INVENTOR. Edwin OBlodgert ATTORNEY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5, 1956 19 Sheets-Sheet '7 INVENTOR. Edwin O. Biodgefl 3W I ATTORN EY April 11, 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 8 INVENTOR. Edwin OBlodgeH ATTORNEY April 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 9 INVENTOR. Edwin OBlodgert ATTORNEY April 11, 1961 E. o. BLODGETT 9,

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 10 I\ 3'; -co Si R g '2 N o o o 0 F|G.20 E a TC 5 DSSC v No 1 BIT No 2 BIT 1 No 3 BIT F No 4 BIT No 5 BIT f No 6 BIT A No 7 BIT f 0 8 f DIC 3, m

l? DSPC ARMLOCK 360 DISTRIBUTOR (FULLLOC CAM No I RESET CHART No I BIT No 2 RESET No 2 BIT G No 5 RESET 88 26' 36" No 3 BIT N0 4 RESET No 5 RESET l76 53' I2" No 5 BIT N0 6 RESET 22I 6' 30' N0 6 BIT N0 7 RESET 7 BW INVENTOR. CTPC EdwIn OBlodgeII CKOC 350 one by COLLECTOR CAM CHART ATTORNEY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM 19 Sheets-Sheet 11 Filed Sept. 5. 1956 INVENTOR. Edwin O. Blodgefi ATTORNEY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 12 INVENTOR. Edwin OBlodgeH ATTOR NEY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5, 1956 19 Sheets-Sheet 13 INVENTOR. Edwin OBlodgeTr ATTORNEY April 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 15 JRZ SPACE MARK 28OOT D I39 28OOT B90. |4OOT A 101 n. l4OOT JRG JRS

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CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5, 1956 19 Sheets-Sheet 16 FlG.25c

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REMOTE TRANSMITTER =0 RECEIVER 0t R6 UNIT TAPE READER UNITBT TAPE PUNCH UNIT ATTORNEY April 1961 E. o. BLODGETT 2,979,564

CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets$heet 17 JPIZ JPII J TAPE FEED JPS SWITCH JPI JPIS //WENTOR Edwin OBlodgerT FlG.25d by ATTORN EY April 11, 1961 E. o. BLODGETT CODE-FORM CONVERTER AND COMMUNICATION SYSTEM Filed Sept. 5. 1956 19 Sheets-Sheet 19 l I I O O (1 a 0 5 b b a 0 TI T2 T3 T4 T5 T6 T7 T8 R! R2 R3 R4 R5 R6 R7 R8 Trans. Line Receiver Line FIG.27

0 O O O T2 T3 T4 T5 T6 T7 T8 R1 R2 R3 R4 R5 R6 R7 R8 Trans.Line F I Receiver Line 6/ 4 T2 T3 T4 T5 T6 iv frs Rl \)R2 R3 R4 R5 TRS R7 R8 T+ O d O g 0 -b \3 O O 0 T1 T2 T3 T4 T5 T6 T7 T8 RI R2 R3 R4 R5 R6 R7 R8 Trans. Line Receiver Line O O O -'O O O O Tl T2 T3 T4 T5 T6 T7 T8 RI R2 R3 R4 R5 *R6 R7 iRS Receiverliligzfi //vv F IG. 3| Edwin OBlodgerT Trans. Li ne ATTORNEY United S tates Patent CODE-FORM CONVERTER AND COMMUNICA- TION SYSTEM Filed Sept. 5, 1956, set. No.'608, 110 71 Claims. Cl. 178-26) The present invention relates to coded-information data transmitters, receivers, and transmission-reception systems in which transmission and reception of coded information may be accomplished by single or plural channels or lines and by use of half-duplex or full-duplex modes of operation. While the invention is of general application, it is particularly suited for translating information code-recorded in punched tape and for rerecording the information after transmission in identical punched-tape form, and will be describedin that connection. i

Information is conventionally transmitted from one point and received at a remote point by the use of various forms of communication code. In one present day standard telecommunication system, information is translated in a code form having groups of five binary-form code bits used as marking bits and spacing bits in various combinations within each. group to represent individual items of information. The code bits of each such code group are presented concurrently (or in parallel) to a distributor mechanism which operates to arrange the code bits ina series or sequential form thereof for transmission. When received, the serially arranged code bits are returned to their concurrent or parallel form by a collector mechanism for ultimate use at the point of reception. Existing structures for this typeof transmission are limited to operation in conjunction with a five bit form of code, which often is not capable of representing the full scope of information which it is desired to translate, and cannot be readily and conveniently modified in structure to operate with any code form of larger information handling capacity. As heretofore constructed and arranged, these prior structures inherently possess an undesired limitation on their rate-of-information capacity, and the communication system of which they conventionally form components has no provision for rapidly and automatically detecting any inaccuracy of communication which may readily occur due to equipment malfunctioning or under certain operating conditions of the communication channel. g g

It is an object of the present inventionto provide a new and improved code transmitter, code receiver, and novel communication system which avoid one or more of the limitations and disadavntages of prior such arrangements.

It is a further object of the invention to provide a unique coded-information communication system par ticularly adapted to use with commercial telegraph channels of any channel quality within a wide range thereof, and one having the ability to verify the accuarcy of the transmission and by signalling back to provide an error indication or interrupt the transmission in the event an error occurs due to faulty transmission, faulty equipment operation, an open transmission channel, or the like.

It is an additional object of the inventionto provide a novel coded-information transmitter and a coded-information receiver, each of relatively simple,.inexpensive, and sturdy construction having exceptionally high reliability in operation, and readily adaptable to a combined transmitter-receiver unit assembly in which both the transmitter and receiver have provision for one or more adjustments easily and simply accomplished either at the factory or in the field to insure optimum operation when used with different transmission channel characteristics.

It is another object of the invention to provide an improved coded-information communication system having a high degree of flexibility in its application to various forms of communication arrangements permitting, as desired, half-duplex operation selectively in both directions between remotely situated points by use of either a two-wire or four-wire communication channel or concurrently in both directions by full-duplex operation. In addition, the novel system of the invention effects automatic and continuous monitoring of all transmissions to terminate further transmission regardless of the direction thereof should an error occur at any time in the coded information as received by the receiver due to equipment malfunctioning or to the fact that the twowire communication channel used, or either two-wire circuit of a four-wire channel becomes open or interrupted for any reason. In the event of an open communication channel, the receiver does not race but rather has its operation automatically halted awaiting correction of the fault.

It is an additional object of the invention to provide a communication system of highly improved accuracy and reliability in operation in which all transmissions are automatically prevented until the remote receiver has been manually placed in proper receiving condition, or in which transmissions are automatically halted in the event the remote receiver is so manually controlled that it ceases to be properly conditioned for accurate reception of the transmitted information, and this without regard to whether either the half-duplex or full-duplex modes of,

operation are employed. This is also true where information is supplied to the transmitter from punch-coded tape and the received information is re-recorded in punched tape and the tape at either the transmitter or receiver'becomes exhausted or excessively tight in its feed through the reader or punch units or is not properly positioned in the reader or punch units to elfect error-free tape reading and punching. An indication is automatically pro vided at the transmitter whenever the receiver is properly conditioned to receive, orafter an automatic halt in transmission an indication is provided when the receiver has been manually restored to proper receiving con-,

dition.

It is yet another object of the invention to provide a coded information transmitter having a substantially improved rate-of-information translation capacity due not only to its novel construction but also to its character of operation with an information reader in which the transmitter translates one group of coded information concurrently with the reading and storage of the next such group in readiness to be applied to the transmitter.

It is a further object of the invention to provide a coded information receiver of substantially improved rate-of-information translation capacity resulting not only from its novel construction but also to its characteristic operation with an information recorded in which a group of received information bits is applied to and stored in an information recorder where it is recorded concurrently with the collection of the next group of received information bits by the receiver in readiness to be applied to the recorder.

Other objects and advantages of the invention will appear as the detailed description proceeds in the light of the drawings forming a part of this application and in which:

Fig. 1 illustrates three units of interconnected equip- 

